The governor and mayor joined victims’ families Friday morning for a brief and quiet ceremony at the finish line on Boylston Street.

Massachusetts Gov. Charlie Baker and his wife, Lauren, bowed their heads in silence after helping the father of one of the three who died, 29-year-old Krystle Campbell, place a white flower wreath. Mayor Marty Walsh placed a second wreath with the families of the other slain victims, 8-year-old Martin Richard and 23-year-old Lingzi Lu.

A bagpipe played softly before the occasion, which was observed by nearly 100 people including survivors, their families and supporters.

A multicolored banner with a peace sign, a heart and words Martin Richard had written before his death — “no more hurting people … peace” — hung on an empty storefront.

Two men placed crosses on a tree honoring the victims, including MIT Police Officer Sean Collier, who was killed by the attackers in the ensuring manhunt.

Scott Weisberg, a 46-year-old Birmingham, Alabama, physician who finished the 2013 marathon seconds before the first bomb detonated, said he comes back each year for the anniversary and to run the race.

Boston Marathon bombing survivor Jeff Bauman, center, walks over the marathon finish line on the third anniversary of the bombings, Friday, April 15, 2016, in Boston. One of the bombers, Dzhokhar Tsarnaev, was sentenced to death in June. His brother, Tamerlan, died in a gunfight with police in the days after the attack. (AP Photo/Michael Dwyer)

He wears hearing aids now because he suffered hearing loss and recently closed his medical practice because he continues to deal with memory loss and speech processing problems from head injuries he sustained in the blast.

“This is a special time to connect. I have a second family who understands what I’m going through,” Weisberg said. “The first year, a lot of us were just trying to figure things out. I think the focus now for many of us is where we’re going, what we’re going to do with the second half of our lives.”

Later in the day, Deval Patrick, the governor at the time of the attacks, is slated to speak at an interfaith service near the finish line.

At 2:49 p.m., a citywide moment of silence will mark the time when the first of two pressure cooker bombs detonated near the race’s end, killing three people and injuring over 260 others.

One of the bombers, Dzhokhar Tsarnaev, was sentenced to death in June. His brother, Tamerlan, died in a gunfight with police in the days after the attack.

Throughout the day, residents will be taking part in blood drives, food and clothing collections and other community service projects as the city has proclaimed April 15 “One Boston Day,” a day to celebrate the city’s resilience through acts of kindness and generosity.

Martin Richard’s family, for example, is leading a cleanup in their Boston neighborhood of Dorchester while Lu’s family is making a financial donation to the Police Department’s Athletic League.

The mayor’s office is collecting premixed baby formula, baby wipes and hand sanitizer to send to Flint, the Michigan city struggling with lead-tainted drinking water.